Logitech V220 Wireless Optical Mouse (Blue) Logitech V220 Wireless Optical Mouse General Features: Blue color Sleek ergonomic design with soft rubber grips 3-buttons Scroll wheel acts as third button 1000 Dpi USB interfaced receiver USB receiver can be snapped to the mouse for easy portability Up to 6 months extended battery life Battery power indicator Tilt-wheel side-to-side scrolling plus zoom